Epsilon Crucis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 21m 21.608s |
| Declination | −60° 24′ 04.13″ |
| Apparent magnitude (V) | 3.58 |
| Characteristics | |
| Spectral type | K3 III |
| Apparent magnitude (B) | 4.98±0.01 |
| Apparent magnitude (G) | 3.1 |
| Apparent magnitude (J) | 1.226±0.274 |
| U−B color index | +1.63 |
| B−V color index | +1.42 |
| Variable type | suspected |
| Astrometry | |
| Radial velocity (Rv) | −4.60 km/s |
| Proper motion (μ) | RA: −171.223 mas/yr Dec.: 91.795 mas/yr |
| Parallax (π) | 14.2±0.1 mas |
| Distance | 230 ± 2 ly (70.4 ± 0.5 pc) |
| Absolute magnitude (MV) | −0.63±0.09 |
| Details | |
| Mass | (1.4 – 1.5)±0.2 M☉ |
| Radius | 31±2 R☉ |
| Luminosity | 282 L☉ |
| Surface gravity (log g) | 1.91 cgs |
| Temperature | 4,210±125 K |
| Metallicity [Fe/H] | −0.03 dex |
| Rotational velocity (v sin i) | 3.14 km/s |
| Age | 2.17 Gyr |
| Other designations | |
| Ginan, ε Cru, NSV 5568, CD−59°4221, FK5 2989, HD 107446, HIP 60260, HR 4700, SAO 251862 | |
| Database references | |
| SIMBAD | data |
Epsilon Crucis, Latinised from ε Crucis (abbreviated Epsilon Cru, ε Cru) and also known as Ginan /ˈɡiːnən/, is a single, orange-hued star in the southern constellation of Crux. Measurements made by the Gaia spacecraft showed an annual parallax shift of 14.2 mas, which provides a distance estimate of about 230 light-years. The star can be seen with the naked eye, having an apparent visual magnitude of 3.58. It is moving closer to the Sun with a radial velocity of −4.60 km/s.
This is a giant star of type K with a stellar classification of K3III, indicating that it has exhausted the hydrogen at its core and evolved away from the main sequence. It is about two billion years old with 1.4–1.5 times the mass of the Sun and has expanded to 31 times the Sun's radius. The star is shining with around 282 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,210 K.